POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Iron pyrite crystals, coloured scanning electron micrograph (SEM). Iron pyrite (iron disulphide, FeS2), commonly known as fool's gold, is the most abundant sulphide mineral and often occurs as cubes. Magnification: x190 when printed at 10 centimetres wide.
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